PC / Server 24/7 Electricity Cost & kWh Consumption Calculator
Calculate how much electricity a gaming PC, home lab server, or NAS consumes and costs per month and year.
Reviewed by: Alexei Volkov • Principal Systems & Cloud Infrastructure Architect
Methodology: Verified Formula
Presets:
Monthly Electricity Cost
$18.43/mo
Annual Power Cost
$221.18/yr
Monthly Energy Used
115.2 kWh/mo
Running 24/7 at 320W would cost $36.86/mo.
Scenario Comparison & Benchmark Table (PC & Server Power Cost)
Compare how scaling Average System Power Draw (Watts) affects your output (click any row to load those values into the calculator above):
| Average System Power Draw (Watts) | Monthly Electricity Cost | Annual Power Cost | Monthly Energy Used |
|---|---|---|---|
| 160 | $9.22/mo | $110.59/yr | 57.6 kWh/mo |
| 240 | $13.82/mo | $165.89/yr | 86.4 kWh/mo |
| 320 (Baseline) | $18.43/mo | $221.18/yr | 115.2 kWh/mo |
| 400 | $23.04/mo | $276.48/yr | 144.0 kWh/mo |
| 480 | $27.65/mo | $331.78/yr | 172.8 kWh/mo |
| 640 | $36.86/mo | $442.37/yr | 230.4 kWh/mo |
Mathematical Formula & Step-by-Step Guide
Primary mathematical equation used by this model:
Daily kWh = (Watts × Hours) / 1,000; Monthly Cost = Daily kWh × 30 × $/kWh
- Configure your primary input (Average System Power Draw (Watts), baseline set to 320) using either the direct numeric box or synchronized range slider.
- Adjust the remaining parameters (Hours Running per Day, Electricity Rate ($ per kWh)) to mirror your exact scenario.
- Examine the primary output alongside the secondary breakdown metrics and the 6-tier benchmark comparison table below.
Primary Standards & References: IETF RFC 8259 (JSON), RFC 4648 (Base64), RFC 9562 (UUIDv4), IEEE 802.3 / CIDR RFC 4632, POSIX.1-2017 File Permissions & Official 2026 LLM Tokenizer Pricing
All encoding, formatting, and cryptographic operations execute 100% locally in your browser via Web Crypto & V8 APIs—zero payload data leaves your device.
All encoding, formatting, and cryptographic operations execute 100% locally in your browser via Web Crypto & V8 APIs—zero payload data leaves your device.
Frequently Asked Questions — PC & Server Power Cost
What mathematical formula does the PC / Server 24/7 Electricity Cost & kWh Consumption Calculator use?
This calculator implements the verified relationship: Daily kWh = (Watts × Hours) / 1,000; Monthly Cost = Daily kWh × 30 × $/kWh. Each variable (Average System Power Draw (Watts), Hours Running per Day, Electricity Rate ($ per kWh)) is evaluated in real time using double-precision floating-point arithmetic so there is zero rounding drift across multi-step scenarios.
How does changing Average System Power Draw (Watts) impact the final result?
Average System Power Draw (Watts) acts as the primary driver in this model (default baseline: 320). Use the Reference Benchmark Table on this page to compare how scaling Average System Power Draw (Watts) from conservative to aggressive levels changes both the primary outcome and secondary ratios.
What standards and sources back this PC & Server Power Cost methodology?
Our model is audited by Alexei Volkov • Principal Systems & Cloud Infrastructure Architect and calibrated against IETF RFC 8259 (JSON), RFC 4648 (Base64), RFC 9562 (UUIDv4), IEEE 802.3 / CIDR RFC 4632, POSIX.1-2017 File Permissions & Official 2026 LLM Tokenizer Pricing. Note: All encoding, formatting, and cryptographic operations execute 100% locally in your browser via Web Crypto & V8 APIs—zero payload data leaves your device.